Data Representation
Akopọ
A photograph, a song and a paragraph of text look nothing alike, yet a computer stores all three the same way: as binary digits. The difference is entirely in how those digits are agreed to be interpreted, letter by letter for text, pixel by pixel for an image, sample by sample for sound.
In this lesson you will learn how characters are encoded using ASCII and Unicode, how a bitmap image's resolution and colour depth determine its uncompressed file size, how an analogue sound wave is converted into binary using sampling, and why the number of bits available always limits how faithful any of these digital representations can be.
Awọn Afojusun
- Understand how computers encode characters using ASCII and Unicode
- Understand how bitmap images are represented in binary (pixels, resolution, colour depth)
- Understand how sound, an analogue signal, is represented in binary
- Understand the limitations of binary representation of data (sampling frequency, resolution) when constructed by the number of available bits
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Data Representation. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- The upper-case letter 'A' has the ASCII code 65. What is the ASCII code of the lower-case letter 'a'? A) 33 B) 66 C) 97 D) 129 Answer: C
- An image is 100 pixels wide, 50 pixels tall, and uses a colour depth of 8 bits. What is its uncompressed file size in bits? A) 4 000 B) 8 000 C) 40 000 D) 400 000 Answer: C
- Which setting controls how many amplitude levels a single digital audio sample can be stored as? A) Sample rate B) Bit depth C) Number of channels D) File format Answer: B
- A recording is made with too low a sample rate. What is the most likely effect on the digital recording? A) The file becomes larger than expected B) Rapid changes in the original sound are missed C) The recording gains extra colour depth D) The recording becomes louder Answer: B
- What is the main reason Unicode was developed alongside ASCII? A) To make text files smaller B) To represent far more characters than ASCII can, covering the world's writing systems and symbols C) To replace binary with a new number system D) To increase a computer's sample rate Answer: B
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Data Representation? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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